JPS5851762A - brushless charging generator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a brushless charging generator, and more particularly to a brushless charging generator in which the exciter output is directly fed to the field winding of the charging generator without a rectifier.

Generally, many generators having claw-shaped magnetic poles are used as charging generators for automobiles.

FIG. 1 is a diagram showing a conventional brushed charging generator, in which a rotor 1 consisting of claw-shaped magnetic poles 2 and a field winding 3 is compatible with a stator core 5 having a built-in armature winding 4. They face each other with a large gap in between and are rotatably supported by a bearing 6. Current is supplied to the field winding 3 from a battery (not shown) via a brush 7 and a slip linter 8.

Since a charging generator with this type of structure uses brushes, there is a need for maintenance and replacement of the brushes and vibrations.

Problems such as noise arise. For this reason, the second brushless
There is a brushless charger with an exciter like the one shown in the figure.

FIG. 2 shows a brushless charging generator that is provided with a new exciter on the same rotating shaft in addition to the charging generator. In FIG. 2, parts that are the same as those in FIG. 1 are given the same reference numerals, and their explanations will be omitted. In the figure, reference numeral 9 denotes a stator core of an exciter, which incorporates an excitation winding 10-. 1
2 is a rotor winding of the exciter, which is built into the rotor core 11. In this case, the excitation winding 1o of the exciter has a third
As shown in the diagram explaining the principle, direct current is supplied from a battery (not shown). Therefore, three-phase Y-connection #(Δ
Since the rotating shaft is mechanically rotated, an alternating current voltage is induced in the rotor winding 12 (which may also be a wire connection). The three-phase AC voltage is passed through a rectifier 1 provided on the rotating shaft.
．． 3 to become a direct current, which is supplied to the field winding 3 of the charging generator. Therefore, the charging generator in FIG. 2 exhibits the same power generation capacity as in FIG. 1.

Since the charging generator having the structure shown in FIG. 2 does not have brushes, the drawbacks caused by the brushes in FIG. 1 are eliminated.

However, the manufacturing process for connecting the rotor winding 12 and the field winding 3 to the rectifier 13 increases, and measures to strengthen the rectifier 13 and the connection wiring to withstand centrifugal stress are required. Further, since the exciter and the rectifier 13 are newly installed on the same rotating shaft, the axial dimension becomes large and the weight of the entire rotating machine increases. Therefore, the fuel consumption of the car deteriorates, and it has disadvantages such as being unable to be installed in the engine room.

The purpose of the present invention is to
Another objective is to provide a compact and robust brushless charging generator that eliminates the need for a rectifier.

The present invention has one stator and one rotor each laminated, the excitation winding of an exciter and the armature winding of a charging generator are wound around the stator core, and the rotation of the exciter is around the rotor core. The child winding and the field winding of the charging generator are wound, and the rotor winding and the field winding are directly connected.

Hereinafter, the present invention will be described in detail based on illustrated embodiments.

FIG. 4 is a diagram showing an embodiment of the present invention. In FIG. 4, parts that are the same as those in FIGS. 1 and 2 are given the same reference numerals, and their explanations will be omitted. In FIG. 4, reference numeral 5 denotes a laminated stator core, in which the excitation winding 10 of the exciter and the armature winding 4 of the charging generator are wound in the same slot or in different slots.

Reference numeral 16 denotes a laminated rotor core, in which the rotating pre-winding 4912 of the exciter and the field winding 3' of the charging generator are wound in the same slot or in different slots. The rotor winding 12 and the field winding 3' are directly connected. Therefore, in the present invention shown in FIG. 4, there is no need to separately install an exciter as shown in FIG. 2, and a rectifier between the exciter and the charging generator is also unnecessary.

FIG. 5 is a diagram showing the principle configuration of FIG. 4. The excitation winding 10 of the exciter is single-phase distributed winding, and the armature winding 4 of the charging generator is three-phase Y-connected (or Δ-connected) as in the prior art.

On the other hand, the rotor winding 12 on the rotation side is distributed wound with two phases, and the field winding 3' is wound with concentrated winding of two phases.

Next, the operation of the charging generator configured as described above will be explained using an equivalent circuit based on the stator of the charging generator shown in FIG. 6, and the principle of power generation will be explained. First, the excitation winding current 〒E of the excitation winding 10 induces an excitation winding induced voltage ERO in the rotor winding 12 of the exciter, and the drop due to the exciter rotor leakage impedance ZER is subtracted. The thing is
The exciter rotor winding field winding terminal voltage becomes VGR. In addition, leakage impedance ZG of the field winding can be calculated from the voltage VOR.
The value obtained by subtracting the drop due to RK becomes the field winding induced voltage EGR of the charging generator. Further, the armature winding induced voltage Ecs of the charging generator is expressed by the following equation (6).

That is, at the rotational speed NR, the frequency fR of the excitation winding is given by n, where the number of poles of the exciter is PE, f*=N*・Pg/1
20 ・・・・・・・・・・・・(1) For the charging generator, the rotating magnetic field speed Nag created by the rotor current of the exciter flowing through the field winding is: If the number of poles of the charging generator is Po, then 1Ncr; = 120 f a/
Pa ・・・・・・・・・・・・・・・(2)5 Also, since the rotor is mechanically rotating at NR, the rotating magnetic field speed Nc seen in stator coordinates is No = Ni :l:Na
z ・・・・・・・・・・・・・・・・・・・・・
...(3) Therefore, the voltage and current frequency f of the charging generator are fa = Na IIPG/ 120 = NR (Pc-t-
Pg) /120・・・・・・・・・・・・ (4) Based on the synchronous speed No., the slip S of the charging generator is: S = NONR/Na = ±PE / PG f P
E ”・”...(5) Therefore, the armature winding induced voltage EGsF1 of the charging generator. , using the winding ratio Ua, EGll=EGR・UG/S ・・・・・・・・・・・・
...(6).

Therefore, the voltage EG11 can be obtained by reducing the slip S, that is, increasing the number of poles Pc of the charging generator and decreasing the number of poles PE of the exciter, to obtain a large AC voltage. a minus the drop in s.

As described above, in the present invention, even if the rotor winding of the exciter is directly connected to the field winding of the charging generator, an alternating current voltage can be generated in the armature winding of the charging generator. In addition, since there is no need to install a new exciter as shown in Figure 2, the axial dimension is small, resulting in a flat generator, and there is no direct connection to the engine, so special rectifiers and connection wiring are required. There is no need to take measures against centrifugal stress, resulting in a robust brushless charging generator.

In Fig. 5, the rotor winding 12 of the exciter and the field winding 3' of the charging generator are two-phase windings, but the same effect can be obtained by using three-phase windings. can. Further, the excitation winding 10 and the rotor winding 12 of the exciter may be concentric windings.

As described above, by adopting the structure of the present invention,
Since there is no rectifier on the rotating side, there is no need for centrifugal stress countermeasures for the rectifier or connection wiring. Therefore, mass productivity is improved, and the reliability of the rotary machine is also improved, allowing stable operation up to high speeds without any problems.

Further, since the windings of the exciter and the charging generator are wound around the same stator core and rotor core, the axial length of the entire rotating machine can be shortened. Next, it can be installed in the engine room without any particular problems, and the overall weight of the rotating machine is lighter, which improves the fuel efficiency of the car.
It has an excellent history in terms of manufacturability.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a conventional brushless charging generator, Fig. 2 is a sectional view of a conventional brushless charging generator with an exciter, Fig. 3 is a diagram explaining the principle of Fig. 2, and Fig. 4 is a sectional view of the present invention. A sectional view showing one embodiment of the invention, FIG. 5 is a diagram explaining the principle of FIG.
This is an equivalent circuit based on the stator of the charging generator shown in the figure. DESCRIPTION OF SYMBOLS 1... Rotor, 2... Claw-shaped magnetic pole, 3.3'... Field winding, 4... Armature winding, 5... Stator core, 6
...Bearing, 7.Brush, 8.Slip ring, 9.Stator core of exciter, 10.Excitation winding, 11.Rotor core of exciter, 12. ...Rotor winding, 13... Rectifier, 14... Rectifier of charging generator, 15... Figure 4 of charging generator, Figure 5 0

Claims (1)

[Claims] 1. Brushless in which the stator core is provided with the excitation winding of the exciter and the armature winding of the charging generator, and the rotor core is provided with the rotor winding of the exciter and the field winding of the charging generator. A brushless charging generator characterized in that a rotor winding output of an exciter is directly supplied to a field winding of a charging generator.